/*var n1='-1';n2=true;c=n1+n2;
console.log(c,typeof c);
var a='小米电脑';os='win10';
document.write('商品名称:'+a);
document.write('&nbsp系统:'+os);

var id='num';name='name'
console.log('编号:'+id,' 姓名:'+name)*/

	var a=document.getElementById('lyb');
	function liuyanban() {
		
	}